Serpentine, runaway winner of this year's Derby at Epsom, has been added to the line-up for Sunday's eagerly awaited Prix de l'Arc de Triomphe.
Trainer Aidan O'Brien already had second favourite Love as one of his contenders for Europe's richest race at ParisLongchamp.
They will try to thwart Enable in her attempt to become the first horse to win the race three times.
A total of 16 runners remain after Wednesday's supplementary entry stage.
Serpentine was the only additional runner, added at a cost of 72,000 euros (£65,000) after pleasing O'Brien with his first race since the Derby when finishing fourth to to stablemate over the Arc course on 13 September.
Mogul, Japan, Sovereign and Love complete O'Brien's team competing for a first prize of nearly £1.5m.
Arc odds
Wednesday 30 September
13-8 Enable, 5-2 Love, 7-1 Stradivarius, 11-1 Sottsass, 14-1 In Swoop, Serpentine 16-1 Raabihah, 20-1 Mogul, 22-1 Persian King, 25-1 Japan, 40-1 Gold Trip, 50-1 Deirdre, Way To Paris, 66-1 Sovereign, 100-1 Chachnak, 150-1 Royal Julius
